Hello, at a minimum you will need to configure network information in the form of IP, subnet mask and gateway. If you aren't using VLAN's, then all of those parameters would exist on VLAN 1. When you add a new L3 interface, enter in VLAN 1, then supply the IP information. Now, when you try to access the AP, you will need to be on the same subnet as the AP (for ease, set the IP address of your computer 1 higher than the AP). For example, if the AP is configured for 192.168.100.1, 255.255.255.0, 192.168.100.254, set your IP to be 192.168.100.2, mask of 255.255.255.0.
This link will get you the basic setup (steps 5 and 6): http://community.cambiumnetworks.com/t5/cnPilot-E-Series-Enterprise-APs/How-to-configure-ePMP-1000-hotspot-e400-e500-to-make-it/m-p/60383#M46
With these links helping with the optimal base configuration and DHCP.